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In the US, Palbociclib (palbociclib systemic) is a member of the drug class CDK 4/6 inhibitors and is used to treat Breast Cancer, Breast Cancer - Metastatic and Liposarcoma.

US matches:



CAS registry number (Chemical Abstracts Service)


Chemical Formula


Molecular Weight


Therapeutic Category

Antineoplastic agent

Chemical Name

6-acetyl-8-cyclopentyl-5-methyl-2-{[5-(piperazin-1-yl)pyridin-2-yl]amino}pyrido[2,3-d]pyrimidin-7(8H)-one (WHO)

Foreign Names

  • Palbociclibum (Latin)
  • Palbociclib (German)
  • Palbociclib (French)
  • Palbociclib (Spanish)

Generic Names

  • Palbociclib (OS: USAN)
  • PD-0332991 (IS)
  • UNII-G9ZF61LE7G (IS)

Brand Name

  • Ibrance
    Pfizer U.S., United States


ISInofficial Synonym
OSOfficial Synonym
Rec.INNRecommended International Nonproprietary Name (World Health Organization)
USANUnited States Adopted Name
WHOWorld Health Organization

Further information on drug naming conventions: International Nonproprietary Names.

Important Notice: The international database is in BETA release. This means it is still under development and may contain inaccuracies. It is not intended as a substitute for the expertise and judgement of your physician, pharmacist or other healthcare professional. It should not be construed to indicate that the use of any medication in any country is safe, appropriate or effective for you. Consult with your healthcare professional before taking any medication.

Further information

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